remove fd-commit, no active devs use it, and requires Auto Name/Name

fd-commit and checkupdates both require that there are two name fields AutoName: and Name:. This is only used for the commit messages. Since the current devs do it manually, we can remove the fd-commit shell script, then focus on checkupdates when revamping AutoName:/Name:.

https://botbot.me/freenode/fdroid-dev/msg/82539152

Also, it makes tab completion in the git repo a lot nicer, since f-Tab will now complete to fdroid, instead of having to do f-d-r-Tab.